What is inconceivable about the universe is that it is at all conceivable.

Our defense is not in our armaments, nor in science, nor in going underground. Our defense is in law and order.

Intellectuals solve problems geniuses prevent them.

I don't know what kind of weapons will be used in the third world war, assuming there will be a third world war.

I don't know what will be used in the next world war, but the 4th will be fought with stones.

The problems that exist in the world today cannot be solved by the level of thinking that created them.

The human spirit needs to accomplish, to achieve, to triumph to be happy.

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

It is, in fact, nothing short of a miracle that the modern methods of instruction have not yet entirely strangled the holy curiosity of inquiry.

It is the theory that decides what we can observe.